You need liquid / solid carbon dioxide. Yes if you've got them and the kit. Look to the right under RELATED on this page. L
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I saw a UK chef attempt this specific thing a couple of weeks ago - his equipment burst before he got enough fizz into his cola. Your options are to use a commercial "soda stream" type device, or to drop pellets of dry ice into bottles of cola and seal them.
The old "coke bottle bomb".
Only if you put too much in. For the chap on TV, it simply became fizz, as the gas dissolved in the cola.
You've got to pump it up with Carbon Dioxide.